# SOLUTION: The depot is using a standard of 635 hours for a particular modification effort. You are to review the standard and determine whether it should be revised. After sampling 20 of the

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 Click here to see ALL problems on Probability-and-statistics Question 213767: The depot is using a standard of 635 hours for a particular modification effort. You are to review the standard and determine whether it should be revised. After sampling 20 of these modifications you calculate a mean of 665 hours and a standard deviation of 45 hours. We are concerned that the hours might be higher or lower than the 635 hour standard. Test the standard at the .10 level of significance. Select the correct answer out of each pair of choices. (Carry intermediate calculations to three decimal places.) 1. The tp is 1.328 1. The tp is 1.729 2. The tc is 2.981 2. The tc is 13.333 3. We would reject the null hypothesis 3. We would fail to reject the null hypothesis 4. We would recommend using the existing standard 4. We would recommend revising the standard Answer by stanbon(57307)   (Show Source): You can put this solution on YOUR website!The depot is using a standard of 635 hours for a particular modification effort. You are to review the standard and determine whether it should be revised. After sampling 20 of these modifications you calculate a mean of 665 hours and a standard deviation of 45 hours. We are concerned that the hours might be higher or lower than the 635 hour standard. Test the standard at the .10 level of significance. Select the correct answer out of each pair of choices. (Carry intermediate calculations to three decimal places.) 1. The tp is 1.328 1. The tp is 1.729 Comment: Not sure what tp means. ------------------------------------- 2. The tc is 2.981 2. The tc is 13.333 Ans: the test statistic is 2.981. ------------------------------------- 3. We would reject the null hypothesis 3. We would fail to reject the null hypothesis Comment: Reject Ho because the p-value is less than 1%. ------------------------------------- 4. We would recommend using the existing standard 4. We would recommend revising the standard Comment: Revise the standard ================================================= Cheers, Stan H.